It's kinda early to film a PV for a single that comes out in March? Wasn't the 19th single to be sung on the 12th live, but not released until March? Usually PVs & photo shoots are about 2-3 months in advance, so this is a little early.
Still think we may get an album in December/January, so it could be a PV for a new song on the album? They've done that before with Makehende, although that may have been a special case and not all members were involved.
Or was it the filming of the introduction video for the 12th live?
Anyway, we'll just need to wait and see